Quality of Service in Modern Packet Networks

Written for the network engineer, this is an easy to follow, yet comprehensive guide as to what Quality of Service technologies are available to deliver deterministic performance in modern packet switched networks. As network applications converge onto a common packet-based infrastructure, delivering Quality of Service for real time traffic has become a critical part of network design. IP and Ethernet based networks, by their very nature, are not best suited to deliver Quality of Service and over the years, there have been many initiatives to address the fundamental issues.This book looks at the differences between packet based and circuit switched networks and the challenges network designers face when migrating applications from circuit switched technologies to packet based infrastructures. This book covers all the relevant topics, which include key Quality of Service models such as Integrated Services and Differentiated Services. Layer 2 Ethernet based services are becoming ever more popular in the service provider domain and so this book comprehensively covers the subject of traffic classification, congestion management, queueing and scheduling at both Layer 2 and Layer 3 in the enterprise and service provider domains.This book also covers traditional and modern Traffic Engineering technologies such as IP MPLS, MPLS-TP and Segment Routing. With network evolving to SDN and API controlled infrastructures, it is important to touch on new technologies such as SD-WAN and how Quality of Service is delivered in SD-WAN environments, as they have the potential to challenge traditional routed networks.Engineering Quality of Service into a network infrastructure is key to delivering real time applications such as voice and video, but in the service provider domain especially, networks will also need a comprehensive set of tools to measure Quality of Service against a defined Service Level Agreement. Therefore, this book also covers in detail the available Quality of Service measurement technologies.Written for the novice and network professional alike, this book is an invaluable reference for this fascinating, complex and critical subject.